Koogle could find himself jailed for a maximum of five years and faces a fine of €45,700 (£27,800) if found guilty.
Yahoo! banned the sale of Nazi memorabilia via its Yahoo! Auction portal almost a year ago, but the case has wrangled on.
In November 2000 Yahoo! was sued by anti-racist groups in France and ordered to stop French people accessing sites through which Nazi memorabilia was being sold.
However, last November a US federal judge ruled that Yahoo!, based in California, could not be bound by French law.
This ruling came after Yahoo! had taken the decision to ban the sale of items related to hate groups such as Nazis and the Ku Klux Klan through its sites.
The new case against Yahoo! could have wide-reaching implications. A guilty verdict would be a serious curb on free speech over the internet. It would also mean that governments would be given the right to regulate content generated in foreign countries under their own laws.
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